Solve the equation. Express radicals in simplest form.x2 = 9 - 4x
A. {-1 + 
, -1 - 
}
B. {-2 + 2
, -2 - 2
}
C. {2 + 
}
D. {-2 + 
, -2 - 
}
Answer: D
Mathematics
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Find all real numbers in the interval [0, 2?) that satisfy the equation. cos2 x - 1 = 0
A. 
B. {0}
C. {0, ?}
D. 
Mathematics
Factor the sum or difference of two cubes.125x3 + 1
A. (5x + 1)(25x2 - 5x - 1) B. (5x + 1)(25x2 + 1) C. (5x + 1)(25x2 + 5x + 1) D. (5x + 1)(25x2 - 5x + 1)
Mathematics
Solve the problem.Because of material shortages, it is increasingly expensive to produce 6.0L diesel engines. In fact, the profit in millions of dollars from producing x hundred thousand engines is approximated by 
where 
Find the point of diminishing returns.
A. (2.75, 106.26) B. (3.67, 16.63) C. (3.67, 62.26) D. (3.67, 106.26)
Mathematics
Solve the equation symbolically.
+ 
= 4
A. 3, 
B. No solution
C. -3
D. 3
Mathematics